Reznor HRPD (Outdoor Duct Furnaces) Unit Installation Manual - Manual (Page 25)

Form I-RP/HRPD, P/N 132210 R14, Page 25
DANGER
The gas burner in this gas-fired equipment is designed and equipped to provide safe,
complete combustion. However, if the installation does not permit the burner to
receive the proper supply of combustion air, complete combustion may not occur.
The result is incomplete combustion which produces carbon monoxide, a poisonous
gas that can cause death. Safe operation of indirect-fired gas burning equipment
requires a properly operating vent system which vents all flue products to the
outside atmosphere. FAILURE TO PROVIDE PROPER VENTING WILL RESULT IN A
HEALTH HAZARD WHICH COULD CAUSE SERIOUS PERSONAL INJURY OR DEATH.
Always comply with the combustion air requirements in the installation codes and
instructions. Combustion air at the burner should be regulated only by manufacturer-
provided equipment. NEVER RESTRICT OR OTHERWISE ALTER THE SUPPLY OF
COMBUSTION AIR TO ANY HEATER.
WARNING
If you turn off the power supply, turn off the gas. See Hazard
Levels, page 2.
This unit will operate with a minimum of maintenance. To ensure long life and satis-
factory performance, a furnace that is operating under normal conditions should be
inspected every four months. If the furnace is operating in an area where an unusual
amount of dust or soot or other impurities are present in the air, more frequent inspec-
tion is recommended.
10.0 Maintenance
and Service
10.1 Maintenance
Schedule
The following procedures should be carried out at least annually (See Paragraphs
10.2.1-10.2.4 for instructions).
 Clean all dirt and grease from the primary and secondary combustion air openings.
 Check the gas valve to ensure that gas flow is being shut off completely.
 Clean the heat exchanger both internally and externally.
 Check the pilot burner and main burners for scale, dust, or lint accumulation.
Clean as needed.
 Power Vent - Check the flue products outlet; clean if needed. Gravity Vent - Check
the vent cap or optional vent system; replace any parts that do not appear sound.
 Check the wiring for any damaged wire. Replace damaged wiring. (See Paragraph
7.0 for wiring requirements.)
CAUTION: When
cleaning, wearing
eye protection is
recommended.
NOTE: Use only factory-
authorized replacement
parts.
Single-
Stage Valve
1/8" INLET
Pressure Tap
1/8” Outlet
Pressure Tap
Two-Stage
Valve
1/8" INLET
Pressure Tap
1/8” Outlet
Pressure
Tap
FIGURE 19 - Top View of Gas Valves
10.2 Maintenance
Procedures
10.2.1 Gas Valve
WARNING
The operating valve is the prime safety shutoff. All gas supply
lines must be free of dirt or scale before connecting to the unit to
ensure positive closure. See Hazard Levels, page 2.
Remove external dirt accumulation and check wiring connections.
The combination gas valve must be checked annually to ensure that the valve is shut-
ting off gas flow completely.
Instructions:
1) Locate the 1/8” FPT INLET pressure tap on the combination valve (FIGURE 19).